题解 | #美妙的约会#
美妙的约会
http://www.nowcoder.com/practice/cc3eef5aed91489f9b706f4196e0d5c6
n = int(input())
n2 = n + n
ipt = input().split(' ')
arr = []
for i in range(n2):
arr.append(int(ipt[i]))
ans = 0
while len(arr) > 0:
first_item = arr.pop(0)
idx = arr.index(first_item)
ans += idx
arr.pop(idx)
print(ans)
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